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Yes, it’s seem to be the best idea, it’s wild because I have previously recap this analog board (the secondary only but most of caps is here) with new caps (and good cap, some Panasonic) but maybe I have omitted one or two or a ESR thing (when I have made some search I have seen some people who...

Some progress, I was able to correctly measure the ripple currents and the voltage under load (logic board connected) in my Analog Board and the result is not that good, I have 4.72V in the 5V rail, witch seem pretty low, and 11.95V in the 12V rail, witch seem correct. The ripple current for...

I was able to make more test The noise comes from Analog Board, and when I apply power to the Analog Board without any load connected (no CRT or logic board) it make no noise.

Some progress, the Analog Board issue is partially fixed. I had just reinstalled the diode is reverse. Now with the MOSFET previously installed, the Macintosh Classic boot properly (it was the amperage of previous MOSFET witch was too low) , but I continue to have this whistling noise, but I am...

Tank you for your response The LB caps have been recapped (with electrolytic, not so great idea but it’s the only thing I have on hand), and the 5V rail is at 295Ohm I have managed to make the situation worse, I have desoldered DP3, DP4, DP5 and DP7 for check (all pass) and now the board...

Hello everyone I have a Macintosh Classic (I have made a post for this computer several years ago), the initial issue has been a checkerboard screen, and the attempt to repair was ended in a blown fuse. Back to this week, I have resumed the work on this computer and I have made some progress...